JezK
Edit File: math-round.js
// Copyright 2011 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // Flags: --allow-natives-syntax var test_id = 0; function testRound(expect, input) { // Make source code different on each invocation to make // sure it gets optimized each time. var doRound = new Function('input', '"' + (test_id++) + '";return Math.round(input)'); assertEquals(expect, doRound(input)); assertEquals(expect, doRound(input)); assertEquals(expect, doRound(input)); %OptimizeFunctionOnNextCall(doRound); assertEquals(expect, doRound(input)); } testRound(0, 0); testRound(-0, -0); testRound(Infinity, Infinity); testRound(-Infinity, -Infinity); testRound(NaN, NaN); // Regression test for a bug where a negative zero coming from Math.round // was not properly handled by other operations. function roundsum(i, n) { var ret = Math.round(n); while (--i > 0) { ret += Math.round(n); } return ret; } assertEquals(-0, roundsum(1, -0)); %OptimizeFunctionOnNextCall(roundsum); // The optimized function will deopt. Run it with enough iterations to try // to optimize via OSR (triggering the bug). assertEquals(-0, roundsum(100000, -0)); testRound(1, 0.5); testRound(1, 0.7); testRound(1, 1); testRound(1, 1.1); testRound(1, 1.49999); testRound(-0, -0.5); testRound(-1, -0.5000000000000001); testRound(-1, -0.7); testRound(-1, -1); testRound(-1, -1.1); testRound(-1, -1.49999); testRound(-1, -1.5); testRound(9007199254740990, 9007199254740990); testRound(9007199254740991, 9007199254740991); testRound(-9007199254740990, -9007199254740990); testRound(-9007199254740991, -9007199254740991); testRound(Number.MAX_VALUE, Number.MAX_VALUE); testRound(-Number.MAX_VALUE, -Number.MAX_VALUE); testRound(536870911, 536870910.5); testRound(536870911, 536870911); testRound(536870911, 536870911.4); testRound(536870912, 536870911.5); testRound(536870912, 536870912); testRound(536870912, 536870912.4); testRound(536870913, 536870912.5); testRound(536870913, 536870913); testRound(536870913, 536870913.4); testRound(1073741823, 1073741822.5); testRound(1073741823, 1073741823); testRound(1073741823, 1073741823.4); testRound(1073741824, 1073741823.5); testRound(1073741824, 1073741824); testRound(1073741824, 1073741824.4); testRound(1073741825, 1073741824.5); testRound(2147483647, 2147483646.5); testRound(2147483647, 2147483647); testRound(2147483647, 2147483647.4); testRound(2147483648, 2147483647.5); testRound(2147483648, 2147483648); testRound(2147483648, 2147483648.4); testRound(2147483649, 2147483648.5); // Tests based on WebKit LayoutTests testRound(0, 0.4); testRound(-0, -0.4); testRound(-0, -0.5); testRound(1, 0.6); testRound(-1, -0.6); testRound(2, 1.5); testRound(2, 1.6); testRound(-2, -1.6); testRound(8640000000000000, 8640000000000000); testRound(8640000000000001, 8640000000000001); testRound(8640000000000002, 8640000000000002); testRound(9007199254740990, 9007199254740990); testRound(9007199254740991, 9007199254740991); testRound(1.7976931348623157e+308, 1.7976931348623157e+308); testRound(-8640000000000000, -8640000000000000); testRound(-8640000000000001, -8640000000000001); testRound(-8640000000000002, -8640000000000002); testRound(-9007199254740990, -9007199254740990); testRound(-9007199254740991, -9007199254740991); testRound(-1.7976931348623157e+308, -1.7976931348623157e+308); testRound(Infinity, Infinity); testRound(-Infinity, -Infinity); // Some special double number cases. var ulp = Math.pow(2, -1022 - 52); var max_denormal = (Math.pow(2, 52) - 1) * ulp; var min_normal = Math.pow(2, -1022); var max_fraction = Math.pow(2, 52) - 0.5; var min_nonfraction = Math.pow(2, 52); var max_non_infinite = Number.MAX_VALUE; var max_smi31 = Math.pow(2,30) - 1; var min_smi31 = -Math.pow(2,30); var max_smi32 = Math.pow(2,31) - 1; var min_smi32 = -Math.pow(2,31); testRound(0, ulp); testRound(0, max_denormal); testRound(0, min_normal); testRound(0, 0.49999999999999994); testRound(1, 0.5); testRound(Math.pow(2,52), max_fraction); testRound(min_nonfraction, min_nonfraction); testRound(max_non_infinite, max_non_infinite); testRound(max_smi31, max_smi31 - 0.5); testRound(max_smi31 + 1, max_smi31 + 0.5); testRound(max_smi32, max_smi32 - 0.5); testRound(max_smi32 + 1, max_smi32 + 0.5); testRound(-0, -ulp); testRound(-0, -max_denormal); testRound(-0, -min_normal); testRound(-0, -0.49999999999999994); testRound(-0, -0.5); testRound(-Math.pow(2,52)+1, -max_fraction); testRound(-min_nonfraction, -min_nonfraction); testRound(-max_non_infinite, -max_non_infinite); testRound(min_smi31, min_smi31 - 0.5); testRound(min_smi31 + 1, min_smi31 + 0.5); testRound(min_smi32, min_smi32 - 0.5); testRound(min_smi32 + 1, min_smi32 + 0.5);